iam planning to make h900 please check the pcb layout .i have widen the tracks as pcbs
availability is of very poor quality.and also can 2 parallel 15 volts zener be used instead of 1 zy15.polarity of bf422/423 is changed will correct it.thanks in advance.

I suggest to use +/-MV and 1k/2W instead 6k8/2W to get +/-15V for ICs,
Nice pcb, do you use coolets pcb as start point?
Regards

hi apex,
will do so as you suggest did you find any other error.and also can two 1 watt
zener be used instead of 1 2watter.yes i used some part as a reference from his
pcb.ill start etching the pcb as soon as you verify it.

to ravslanka (u have done a great job)
i just love ur layout , i am gonna use ur layout, i have attached the picture of ur pcb with a few red circles whr i think the traces should be a bit thin cause producing high resolution pcbs is nt always possible and there can be shorts , so if possible reduce the track size at the indicated positions ............. and can u add few more o/p transistors if possible just to be on the safe side.

hi apex,
will do so as you suggest did you find any other error.and also can two 1 watt
zener be used instead of 1 2watter.yes i used some part as a reference from his
pcb.ill start etching the pcb as soon as you verify it.

thanks

ravs

be a vegeterian......

I will verify final pcb, what is pcb size.
You can use one 1W zener if you use +/-MV.
Regards

With 2 step class-h with 1943/5200 pairs you cant increase your rails beyond 70VDC per step. Around 3.5kW could be manageable with 14-16 pairs at output for continuous duty cycle operation into 2 ohms.